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Global Supply Issues

Like many other iindustries, the Fire Alarm and CCTV markets are subject to extended lead times due to global supplies of Electronic Components and Plastics. 

Whiilst we carry large stocks of the most popular equipment, there are some items where we are experiencing longer than normal delivery times. You can be assured that we are doing all we can to miniimise the disruption this can cause.

We recommend that Orders are placed as soon as possible and to enquire if you need us to meet speciific delivery dates. As always, we endeavour to meet our customerrs requirements but recognise there may be some delays and trust you appreciiate this is outside of our control.

Advanced PSU and Chargers

The Advanced 1.5A, 3.0A and 5.0A power supply units can be used for any fire alarm system which specifies EN54-4 power supply equipment.

Suited for almost any application, the power supply unit/battery charger has been developed using the latest surface mount technology to provide a high efficiency switch mode power supply.

The power supply units are available in fully enclosed construction providing power and fault indication or alternatively in caged versions for mounting into existing enclosures of various sizes to suit different battery capacities.

PSE and charger or PSE only options on the 3.0A and 5.0A versions.

A Serial Link option is provided on the 3.0A and 5.0A versions. Allows reporting of PSE status and voltages / current measurements to compatible control panel / modules.

These units are available as follows:
  • Mxp-549: 1.5A PSE in 7Ah enclosure
  • Mxp-550: 3.0A PSE in 17Ah enclosure
  • Mxp-550/D: 3.0A PSE in 38Ah enclosure
  • Mxp-551: 5.0A PSE in 17Ah enclosure
  • Mxp-551/D: 5.0A PSE in 38Ah enclosure


For any fire alarm system which specifies EN54-4 power supplies (e.g. BS5839 code of practice).

These power supply units can be used in any fire alarm installation requiring a 24Volt supply for operation.


A range of power supply equipment with power output options to suit most applications

Universal AC input on the 3.0A and 5.0A versions.

High efficiency switched mode power supplies

Compact 1.5A, 3.0A and 5.0A versions v1.0

Key Features

  • Approved EN54-4
  • Boxed or un-boxed
  • Power and fault indication
  • 3 Year Warranty


Approvals:                                             All power supply units are approved with the requirements of BS EN54-4 1998, EN55022                                                                               class B emissions limits & EN60950: 2000 safety standards.

Input Supply:                                         1.5A PSE:220-240V AC, 50/60Hz, fuse T3.15H250 - 3.0A/5.0A PSE:200-240V AC, 50/60Hz,                                                                              fuse T3.15H250

Output Voltage:                                     Max 28.5V DC, Min 18.5V DC at minimum battery voltage of 19V with mains disconnected

Charger voltage:                                  27.4V DC nominal at 20°C temperature compensated over the range -5°C to +45°C

Output Current:                                    1.5A PSU: 1.0A continuous load, 0.5A battery charge

                                                                3.0A PSU: 2.0A continuous load, 1.0A battery charge [3.0A to load if configured for PSU only]

                                                                5.0A PSU: 3.0A continuous load, 2.0A battery charge [5.0A to load if configured for PSU only]

Dimensions Boxed H x W x D mm:  7Ahr 263 x 246 x 85. 17Ahr 378 x 338 x 110. 38Ahr 410 x 363 x 185.

Enviroment:                                           Indoor, dry

Fault Output:                                          Volt-free change-over contacts rated 1A @ 30V dc

On Board Indication:                            Mains Fail, Charger Fail, Battery Open Circuit, Battery Low & Heartbeat


Mxp-549: 1.5A EN54-4 PSU & Charger (boxed - up to 7Ah battery capacity).  


Mxp-550: 3A EN54-4 PSU & Charger (boxed - up to 17Ah battery capacity).  


Mxp-550D: 3A EN54-4 PSU & Charger (boxed, deep enclosure - up to 38Ah battery capacity).  


Call for Price

Mxp-551: 5A EN54-4 PSU & Charger (boxed - up to 17Ah battery capacity).

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